Clear chunk on dimension switch

This should resolve chunks being leftover in instances such as server switches in proxies.

Author: Camotoy

connector/src/main/java/org/geysermc/connector/network/session/cache/ChunkCache.java

@@ -67,7 +67,7 @@ public void addToCache(Column chunk) {
         chunks.put(chunkPosition, geyserColumn);
     }
 
-    public GeyserColumn getChunk(int chunkX, int chunkZ)  {
+    public GeyserColumn getChunk(int chunkX, int chunkZ) {
         long chunkPosition = MathUtils.chunkPositionToLong(chunkX, chunkZ);
         return chunks.getOrDefault(chunkPosition, null);
     }
@@ -136,6 +136,19 @@ public void removeChunk(int chunkX, int chunkZ) {
         chunks.remove(chunkPosition);
     }
 
+    /**
+     * Manually clears all entries in the chunk cache.
+     * The server is responsible for clearing chunk entries if out of render distance (for example) or switching dimensions,
+     * but it is the client that must clear chunks in the event of proxy switches.
+     */
+    public void clear() {
+        if (!cache) {
+            return;
+        }
+
+        chunks.clear();
+    }
+
     public int getChunkMinY() {
         return minY >> 4;
     }

connector/src/main/java/org/geysermc/connector/utils/DimensionUtils.java

@@ -60,6 +60,7 @@ public static void switchDimension(GeyserSession session, String javaDimension)
         int bedrockDimension = javaToBedrock(javaDimension);
         Entity player = session.getPlayerEntity();
 
+        session.getChunkCache().clear();
         session.getEntityCache().removeAllEntities();
         session.getItemFrameCache().clear();
         session.getLecternCache().clear();